A low power oscillating circuit

Abstract

The invention discloses a low-power consumption oscillating circuit. The low-power consumption oscillating circuit comprises a start-up circuit, a controlled oscillation circuit, a reference current source circuit and a drive circuit, wherein the reference current source circuit comprises a constant current source and configurable current source group and a confluence circuit; the controlled oscillation circuit comprises multi-stage identical current-controlled inverter circuits arranged in a cascaded manner; the reference current source circuit generates a reference current which is irrelative to the power supply voltage, the temperature and the process; the size of output currents of the reference current source circuit is configured by external digital control signals; by adjusting the reference current output by the reference current source circuit, the control of oscillation frequency of the controlled oscillation circuit can be realized, while the adjusted reference current can be provided for the drive circuit to serve as the reference voltage; and the frequency generated by the controlled oscillating circuit is output by the drive circuit. The low-power consumption oscillating circuit can be flexibly used in wake-up circuits of various wireless transceiver radio frequency chips, and is particularly suitable for low-power consumption occasions where working voltage is wide in changing range, and the low-power circuit for battery power supply is required..

Description

Background technique [0001] In recent years, with the continuous emergence of new technologies in the field of information technology and the continuous advancement of technology, various applications with limited power consumption need to use low-power wake-up circuits, and the wake-up circuits need to provide clocks that can detect the frequency of the current output signal circuit, and it is required that this clock circuit can cover a wide enough range to ensure that it can be adjusted under the conditions of temperature and process changes and voltage changes. [0002] As we all know, in order to improve the portability and flexibility of the system, short-distance wireless communication systems are powered by batteries. This power supply method requires that most of the wireless communication chips do not work normally, and communicate with the outside through the built-in wake-up circuit. If it is necessary to wake up the entire chip through the internal wake-up circuit...

AI Technical Summary

Problems solved by technology

The implementation of this technical solution not only increases the number of off-chip circuits and power consumption, but also greatly increases the cost of the system. It can only be applied to occasions that do not require strict power consumption and low cost requirements

[0005] In summary, there are many defects in the crystal oscillator circuit adopted in the wireless radio frequency transceiver or wake-up circuit of the prior art: first, the traditional crystal oscillator circuit cannot work in the occasion where the power supply voltage changes greatly, and the actual wireless communication system, due to the use of Battery-powered, as the working time becomes longer, the power supply voltage will drop during work, and the traditional crystal oscillator circuit cannot meet the requirements of a relatively wide working voltage range

Second, the oscillation frequency output by the crystal oscillator circuit is greatly affected by temperature and process changes, and to control the influence of temperature and process changes, an additional off-chip circuit needs to be added, resulting in the inability to meet the requirements of low cost and high integration of the system

Third, the external drive circuit used in the crystal oscillator circuit is composed of multi-stage inverters with a fixed width-to-length ratio. The drive of the core drive circuit needs to consume a large current, which directly affects the low power consumption performance of the circuit and makes the voltage application range of the circuit drop sharply.

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